Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas vagas aconteceram em 25 de maio?
 ###Tabelas: CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR) CREATE TABLE prize_money_won (prize_money_won_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Group Legs won INT, Play-Off Legs won INT, Winners Group Legs won INT, Winners Play-Off Legs won INT, Final position money won* VARCHAR, Total money won VARCHAR) CREATE TABLE west_donegal_railway (west_donegal_railway_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Type VARCHAR, Fleet numbers VARCHAR, Quantity made INT, Manufacturer VARCHAR, Date made INT, Date withdrawn VARCHAR) CREATE TABLE 1945–63 (1945–63_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, Rank VARCHAR, Avg.Att. VARCHAR, Top Goalscorer VARCHAR, Goals INT) CREATE TABLE quarterfinal_1 (quarterfinal_1_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Athlete VARCHAR, Country VARCHAR, Time VARCHAR, Notes VARCHAR)  
SELECT COUNT Manner of departure FROM managerial_changes WHERE Date of vacancy = 25 May